Tread-grip for vehicle-tires.



No. 896,728. PATENTED AUG. 25, 1902; 0. L. HOPE. TREAD GRIP FOR VEHICLE TIRES.

APPLICATION FILED MAR. 1, 1907.

Wi impose:

Ai villa) 5%?" ures indicate the same CARLTON L. HOFE, OF YORK, PENNSYLV ANIA 'r'nEAn-GRIP FOB VEHICLE-TIRES.

Specification of Letters Patent.

Patented Aug.'. 25, 1908.

Application filed March 1, 1907. s mi no. 360,025.

To all whom it inay concern:

Be a known that I, CARLTON L. Hm, 5f

York, in the county of York, State ofPennsylvania, have invented a certain new and l 5 useful Improvement in Tread Grips for Vehicle-Tires; and I do hereby declare the following to be a full, clear, and exact. description of the same, reference being had to the accompanying drawings, forming a part of this specification, and to the figures and letters of reference marked thereon.

This invention relates to detachable trendgrip anti-slipping and QIIiJi-Sklddillg"ii(h-1GBS for vehicle wheels. Devices of thischaracter are particularly applicable to vehicle wheels having rubber or pneumatic tires and the object of the invention is to produce a device of moderate cost and high efiiciency.

A further object is to rovide'a device capable, under certain con 'tions, of serving as a protecting armorand wear surface for the tread portion of the tire.

The invention consists in certain novel details of construction and combinations and arrangements'of parts all as will be now described and pointed out particularly in the ap ended claims.

n. the accompanying drawingsFigure 1 is a side elevatlon partly broken away and partly diagrammatic, of a wheel having a pneumatic tire and a tread-grip embodying the present invention. Fig. 2 is a plan view of a short section of the tread-grip extended. Fig. 3 is a diagrammatic cross section through a tire and tread-grip as shown in Fig; 1.

ike letters of reference in the several figarts.

. The vehicle wheel W 'ch may be of any v40 ordinary Qrpreferred type or character is indicated by the letter A, but as shown, it embodies an ordinary pneumatic tire. The tread-grip forming the novel subject matter of the present invention is composed essentially of separate tread chains extending around the tire substantially concentric to the axis of the wheel and suitable connecting links between the chains at spaced intervals.

The actual wear or tread portion of the 5 gripis composed of a; plurality, preferably three separate reaches 0 chain C'of such size orlength "asto fit the treadportion of the tire with a fair degree. of'jaaccuracy, although it {will be understood lthat a ti ht --fit.,isnot; to essential nor an the otherhan is a tight fit when the tireis fully. inflated objectionable."

The number ofseparate reaches of chain-I may be made sufiicient to support the surface of the tire out of contact with the road surface where it is desired that the grip shall also form the wear face of the tire, or a less number of chains may be employed 'where' the object is only to prevent slipping or skidding, but in all cases the tread c entirely around the Wheel on the tread por ains extendtion so as to lie between the tire and roadway at every point in the angular movement or rotation of the wheel.

The peripheral or tread chains are prefer-. ably ,though notnecessarily, each endless and while each reach is separate from the other the chains are connected at spaced intervals by links or hooks whereby their general rela- .tive positions are maintained. The chains as a whole'are preferably held in place by lateral chains lying at each side of and within the greatest diameter of the tire. Straps passing inside of the rim may be employed as a securing means. p

The chains C are preferably composed of inks or books connected to side ordinary twisted iinks as shown and at the points where the connecting links are applied a single link may be --left untwisted,

thus untwisted links areleft at D and the connecting links E take into the saiddintwisted'links, but this is not essential as the connecting links may take'into the ordinary twisted links as shown-at F. The connect; 'ing links E and F are both preferably formed of metal rod haviiig' eyes a at each end and hence may be n1a e long or short as desired. Where the chain links a're twisted as at the links F the eyes should be turned at an angle to each other so as to surround the bars of the chain links at substantially right angles- The links G connecting the tread chains 0 and side chain H are preferably relatively long single links, but it is obvious that more a than one link may be employed .ifldcisired." Said side chains Hare preferably. iconippsed of ordinary straight links and are provided withlocks or locking hooks of well-known; v construction, whereby the continuity of these chains may be temporarily broken for-ap plying or removing the I tread-egriplin'the well known way.

The straps M extend from one-sideto the? other around the inner sidefoffithegrim nd form a positive means. for-prev the grip rronrtraveling rcun o the inasmuch as the p se tlstructur "lieshown, the tread chains sreeonnected to gether'at a greater number of points than the points of connection between the tread vii-iniins and side chains or straps but said connections are always spaced apart a sulficlent distance to permit of an independent 1 lateral nwveinent of each chainthus each rolling ;trcad-chein is free to conform toirregularities and to position itseli independently of the others. i I

The revision of continuous peripheral or tread-c mins insures the interposition of the grip membersbetween the tire. and road sur face at every point, it prevents either slipping or skidding in either an angular or side- 'w 'se direction and ellectuall y overcomes any ionel" the chain on the tire. The resistance to sridding very pronounced b if the lact that the skidding move-- mend take place transversely of thetread i ell-aims and'the latter are free to' act and position themselves independently of each 1. AI tread-grip forvehiole tires embody-- ing'a 'plurality of substantially parallel tread chains extending longitudinally of the tire and formed of twisted links and straight links at spaced intervals, links connecting the straight links of-adjacent chains, side chains and links connecting saidside chains andedge tread chains at spaced intervals.

2. Atread-griv for vehicle tires embodying aplurality of substantially paralleltread chains extending longitudinally of the tire and formed of twisted links and links connecting adjacent chains formed with eyes twisted with relation to each other to engage the side bars of the twisted chain links at substantially right angles theret0 CARLTON LHOFF.

, Witnesses:

' Jos. F." SAMPLE,

ANDREW Klv Hnnsnnv. 

